Graphene-MoS2-Au-TiO2-SiO2 Hybrid SPR Biosensor for Formalin Detection: Numerical Analysis and Development

¹Department of Electrical and Electronic Engineering, Jashore University of Science and Technology, Jashore, Bangladesh

²Department of Electrical and Electronic Engineering, Bangladesh Army University of Engineering and Technology, Bangladesh

³Department of Computer Science, Cihan University-Slemani, Sulaimaniya, Iraq

⁴Department of Electrical & Electronic Engineering, Rajshahi University of Engineering & Technology, Rajshahi, Bangladesh

Adv. Mater. Lett., 2019, 10 (9), pp 656-662

DOI: 10.5185/amlett.2019.0001

Publication Date (Web): Mar 01, 2019

Copyright © IAAM-VBRI Press

E-mail: biplobh.eee10@gmail.com

Abstract

In this letter, a surface plasmon resonance (SPR) biosensor is numerically investigated that used Graphene-MoS₂-Au-TiO₂-SiO₂ hybrid structure for the detection of formalin. This developed sensor sensed the presence of formalin based on attenuated total reflection (ATR) method by observing the change of “surface plasmon resonance (SPR) angle versus the change of minimum reflectance” attributor and “the surface plasmon resonance frequency (SPRF) versus maximum transmittance” attributor. Chitosan is used as probe legend to perform the particular reaction with the formalin (formaldehyde) as target legend. Here, graphene as well as MoS₂ are used as biomolecular recognition element (BRE), TiO₂-SiO₂ bilayer as the improvement of sensitivity and Gold (Au) as the sharp SPR curve. Numerical results are appeared that the variation of SPRF and SPR angle for improper sensing of formalin is quite negligible that confirms the absence of formalin whereas for proper sensing is considerably countable that confirms the presence of formalin. It is also shown that the sensitivity of conventional SPR sensor is 70.74% and the graphene–MoS₂-based sensor is enhanced to 77% with respect conventional SPR sensor. The sensitivity is further enhanced to 79 % by including TiO₂–SiO₂ composite layer with respect to conventional SPR sensor. At the end of this letter, a comparative study of the sensitivity of the proposed work with the existing works is discussed.  © VBRI Press.

Keywords

Biosensor, surface plasmon resonance, formalin detection, resonance angle, resonance frequency.